Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  Routines for control of the CS8427 via i2c bus

 *  IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic

 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>

 *

 *

 *   This program is free software; you can redistribute it and/or modify

 *   it under the terms of the GNU General Public License as published by

 *   the Free Software Foundation; either version 2 of the License, or

 *   (at your option) any later version.

 *

 *   This program is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU General Public License for more details.

 *

 *   You should have received a copy of the GNU General Public License

 *   along with this program; if not, write to the Free Software

 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

 *

 */

#include <sound/driver.h>

#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <sound/core.h>

#include <sound/control.h>

#include <sound/pcm.h>

#include <sound/cs8427.h>

#include <sound/asoundef.h>

static void snd_cs8427_reset(struct snd_i2c_device *cs8427);

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");

MODULE_DESCRIPTION("IEC958 (S/PDIF) receiver & transmitter by Cirrus Logic");

MODULE_LICENSE("GPL");

#define CS8427_ADDR                     (0x20>>1) /* fixed address */

struct cs8427_stream {

        struct snd_pcm_substream *substream;

        char hw_status[24];             /* hardware status */

        char def_status[24];            /* default status */

        char pcm_status[24];            /* PCM private status */

        char hw_udata[32];

        struct snd_kcontrol *pcm_ctl;

};

struct cs8427 {

        unsigned char regmap[0x14];     /* map of first 1 + 13 registers */

        unsigned int rate;

        unsigned int reset_timeout;

        struct cs8427_stream playback;

        struct cs8427_stream capture;

};

static unsigned char swapbits(unsigned char val)

{

        int bit;

        unsigned char res = 0;

        for (bit = 0; bit < 8; bit++) {

                res <<= 1;

                res |= val & 1;

                val >>= 1;

        }

        return res;

}

int snd_cs8427_reg_write(struct snd_i2c_device *device, unsigned char reg,

                         unsigned char val)

{

        int err;

        unsigned char buf[2];

        buf[0] = reg & 0x7f;

        buf[1] = val;

        if ((err = snd_i2c_sendbytes(device, buf, 2)) != 2) {

                snd_printk(KERN_ERR "unable to send bytes 0x%02x:0x%02x "

                           "to CS8427 (%i)\n", buf[0], buf[1], err);

                return err < 0 ? err : -EIO;

        }

        return 0;

}

EXPORT_SYMBOL(snd_cs8427_reg_write);

static int snd_cs8427_reg_read(struct snd_i2c_device *device, unsigned char reg)

{

        int err;

        unsigned char buf;

        if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {

                snd_printk(KERN_ERR "unable to send register 0x%x byte "

                           "to CS8427\n", reg);

                return err < 0 ? err : -EIO;

        }

        if ((err = snd_i2c_readbytes(device, &buf, 1)) != 1) {

                snd_printk(KERN_ERR "unable to read register 0x%x byte "

                           "from CS8427\n", reg);

                return err < 0 ? err : -EIO;

        }

        return buf;

}

static int snd_cs8427_select_corudata(struct snd_i2c_device *device, int udata)

{

        struct cs8427 *chip = device->private_data;

        int err;

        udata = udata ? CS8427_BSEL : 0;

        if (udata != (chip->regmap[CS8427_REG_CSDATABUF] & udata)) {

                chip->regmap[CS8427_REG_CSDATABUF] &= ~CS8427_BSEL;

                chip->regmap[CS8427_REG_CSDATABUF] |= udata;

                err = snd_cs8427_reg_write(device, CS8427_REG_CSDATABUF,

                                           chip->regmap[CS8427_REG_CSDATABUF]);

                if (err < 0)

                        return err;

        }

        return 0;

}

static int snd_cs8427_send_corudata(struct snd_i2c_device *device,

                                    int udata,

                                    unsigned char *ndata,

                                    int count)

{

        struct cs8427 *chip = device->private_data;

        char *hw_data = udata ?

                chip->playback.hw_udata : chip->playback.hw_status;

        char data[32];

        int err, idx;

        if (!memcmp(hw_data, ndata, count))

                return 0;

        if ((err = snd_cs8427_select_corudata(device, udata)) < 0)

                return err;

        memcpy(hw_data, ndata, count);

        if (udata) {

                memset(data, 0, sizeof(data));

                if (memcmp(hw_data, data, count) == 0) {

                        chip->regmap[CS8427_REG_UDATABUF] &= ~CS8427_UBMMASK;

                        chip->regmap[CS8427_REG_UDATABUF] |= CS8427_UBMZEROS |

                                CS8427_EFTUI;

                        err = snd_cs8427_reg_write(device, CS8427_REG_UDATABUF,

                                                   chip->regmap[CS8427_REG_UDATABUF]);

                        return err < 0 ? err : 0;

                }

        }

        data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;

        for (idx = 0; idx < count; idx++)

                data[idx + 1] = swapbits(ndata[idx]);

        if (snd_i2c_sendbytes(device, data, count + 1) != count + 1)

                return -EIO;

        return 1;

}

static void snd_cs8427_free(struct snd_i2c_device *device)

{

        kfree(device->private_data);

}

int snd_cs8427_create(struct snd_i2c_bus *bus,

                      unsigned char addr,

                      unsigned int reset_timeout,

                      struct snd_i2c_device **r_cs8427)

{

        static unsigned char initvals1[] = {

          CS8427_REG_CONTROL1 | CS8427_REG_AUTOINC,

          /* CS8427_REG_CONTROL1: RMCK to OMCK, valid PCM audio, disable mutes,

             TCBL=output */

          CS8427_SWCLK | CS8427_TCBLDIR,

          /* CS8427_REG_CONTROL2: hold last valid audio sample, RMCK=256*Fs,

             normal stereo operation */

          0x00,

          /* CS8427_REG_DATAFLOW: output drivers normal operation, Tx<=serial,

             Rx=>serial */

          CS8427_TXDSERIAL | CS8427_SPDAES3RECEIVER,

          /* CS8427_REG_CLOCKSOURCE: Run off, CMCK=256*Fs,

             output time base = OMCK, input time base = recovered input clock,

             recovered input clock source is ILRCK changed to AES3INPUT

             (workaround, see snd_cs8427_reset) */

          CS8427_RXDILRCK,

          /* CS8427_REG_SERIALINPUT: Serial audio input port data format = I2S,

             24-bit, 64*Fsi */

          CS8427_SIDEL | CS8427_SILRPOL,

          /* CS8427_REG_SERIALOUTPUT: Serial audio output port data format

             = I2S, 24-bit, 64*Fsi */

          CS8427_SODEL | CS8427_SOLRPOL,

        };

        static unsigned char initvals2[] = {

          CS8427_REG_RECVERRMASK | CS8427_REG_AUTOINC,

          /* CS8427_REG_RECVERRMASK: unmask the input PLL clock, V, confidence,

             biphase, parity status bits */

          /* CS8427_UNLOCK | CS8427_V | CS8427_CONF | CS8427_BIP | CS8427_PAR,*/

          0xff, /* set everything */

          /* CS8427_REG_CSDATABUF:

             Registers 32-55 window to CS buffer

             Inhibit D->E transfers from overwriting first 5 bytes of CS data.

             Inhibit D->E transfers (all) of CS data.

             Allow E->F transfer of CS data.

             One byte mode; both A/B channels get same written CB data.

             A channel info is output to chip's EMPH* pin. */

          CS8427_CBMR | CS8427_DETCI,

          /* CS8427_REG_UDATABUF:

             Use internal buffer to transmit User (U) data.

             Chip's U pin is an output.

             Transmit all O's for user data.

             Inhibit D->E transfers.

             Inhibit E->F transfers. */

          CS8427_UD | CS8427_EFTUI | CS8427_DETUI,

        };

        int err;

        struct cs8427 *chip;

        struct snd_i2c_device *device;

        unsigned char buf[24];

        if ((err = snd_i2c_device_create(bus, "CS8427",

                                         CS8427_ADDR | (addr & 7),

                                         &device)) < 0)

                return err;

        chip = device->private_data = kzalloc(sizeof(*chip), GFP_KERNEL);

        if (chip == NULL) {

                snd_i2c_device_free(device);

                return -ENOMEM;

        }

        device->private_free = snd_cs8427_free;

        snd_i2c_lock(bus);

        err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);

        if (err != CS8427_VER8427A) {

                /* give second chance */

                snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: "

                           "let me try again...\n", err);

                err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);

        }

        if (err != CS8427_VER8427A) {

                snd_i2c_unlock(bus);

                snd_printk(KERN_ERR "unable to find CS8427 signature "

                           "(expected 0x%x, read 0x%x),\n",

                           CS8427_VER8427A, err);

                snd_printk(KERN_ERR "   initialization is not completed\n");

                return -EFAULT;

        }

        /* turn off run bit while making changes to configuration */

        err = snd_cs8427_reg_write(device, CS8427_REG_CLOCKSOURCE, 0x00);

        if (err < 0)

                goto __fail;

        /* send initial values */

        memcpy(chip->regmap + (initvals1[0] & 0x7f), initvals1 + 1, 6);

        if ((err = snd_i2c_sendbytes(device, initvals1, 7)) != 7) {

                err = err < 0 ? err : -EIO;

                goto __fail;

        }

        /* Turn off CS8427 interrupt stuff that is not used in hardware */

        memset(buf, 0, 7);

        /* from address 9 to 15 */

        buf[0] = 9;      /* register */

        if ((err = snd_i2c_sendbytes(device, buf, 7)) != 7)

                goto __fail;

        /* send transfer initialization sequence */

        memcpy(chip->regmap + (initvals2[0] & 0x7f), initvals2 + 1, 3);

        if ((err = snd_i2c_sendbytes(device, initvals2, 4)) != 4) {

                err = err < 0 ? err : -EIO;

                goto __fail;

        }

        /* write default channel status bytes */

        buf[0] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 0));

        buf[1] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 8));

        buf[2] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 16));

        buf[3] = ((unsigned char)(SNDRV_PCM_DEFAULT_CON_SPDIF >> 24));

        memset(buf + 4, 0, 24 - 4);

        if (snd_cs8427_send_corudata(device, 0, buf, 24) < 0)

                goto __fail;

        memcpy(chip->playback.def_status, buf, 24);

        memcpy(chip->playback.pcm_status, buf, 24);

        snd_i2c_unlock(bus);

        /* turn on run bit and rock'n'roll */

        if (reset_timeout < 1)

                reset_timeout = 1;

        chip->reset_timeout = reset_timeout;

        snd_cs8427_reset(device);

#if 0   // it's nice for read tests

        {

        char buf[128];

        int xx;

        buf[0] = 0x81;

        snd_i2c_sendbytes(device, buf, 1);

        snd_i2c_readbytes(device, buf, 127);

        for (xx = 0; xx < 127; xx++)

                printk(KERN_DEBUG "reg[0x%x] = 0x%x\n", xx+1, buf[xx]);

        }

#endif

        if (r_cs8427)

                *r_cs8427 = device;

        return 0;

      __fail:

        snd_i2c_unlock(bus);

        snd_i2c_device_free(device);

        return err < 0 ? err : -EIO;

}

EXPORT_SYMBOL(snd_cs8427_create);

/*

 * Reset the chip using run bit, also lock PLL using ILRCK and

 * put back AES3INPUT. This workaround is described in latest

 * CS8427 datasheet, otherwise TXDSERIAL will not work.

 */

static void snd_cs8427_reset(struct snd_i2c_device *cs8427)

{

        struct cs8427 *chip;

        unsigned long end_time;

        int data, aes3input = 0;

        snd_assert(cs8427, return);

        chip = cs8427->private_data;

        snd_i2c_lock(cs8427->bus);

        if ((chip->regmap[CS8427_REG_CLOCKSOURCE] & CS8427_RXDAES3INPUT) ==

            CS8427_RXDAES3INPUT)  /* AES3 bit is set */

                aes3input = 1;

        chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~(CS8427_RUN | CS8427_RXDMASK);

        snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,

                             chip->regmap[CS8427_REG_CLOCKSOURCE]);

        udelay(200);

        chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RUN | CS8427_RXDILRCK;

        snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,

                             chip->regmap[CS8427_REG_CLOCKSOURCE]);

        udelay(200);

        snd_i2c_unlock(cs8427->bus);

        end_time = jiffies + chip->reset_timeout;

        while (time_after_eq(end_time, jiffies)) {

                snd_i2c_lock(cs8427->bus);

                data = snd_cs8427_reg_read(cs8427, CS8427_REG_RECVERRORS);

                snd_i2c_unlock(cs8427->bus);

                if (!(data & CS8427_UNLOCK))

                        break;

                schedule_timeout_uninterruptible(1);

        }

        snd_i2c_lock(cs8427->bus);

        chip->regmap[CS8427_REG_CLOCKSOURCE] &= ~CS8427_RXDMASK;

        if (aes3input)

                chip->regmap[CS8427_REG_CLOCKSOURCE] |= CS8427_RXDAES3INPUT;

        snd_cs8427_reg_write(cs8427, CS8427_REG_CLOCKSOURCE,

                             chip->regmap[CS8427_REG_CLOCKSOURCE]);

        snd_i2c_unlock(cs8427->bus);

}

static int snd_cs8427_in_status_info(struct snd_kcontrol *kcontrol,

                                     struct snd_ctl_elem_info *uinfo)

{

        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;

        uinfo->count = 1;

        uinfo->value.integer.min = 0;

        uinfo->value.integer.max = 255;

        return 0;

}

static int snd_cs8427_in_status_get(struct snd_kcontrol *kcontrol,

                                    struct snd_ctl_elem_value *ucontrol)

{

        struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);

        int data;

        snd_i2c_lock(device->bus);

        data = snd_cs8427_reg_read(device, kcontrol->private_value);

        snd_i2c_unlock(device->bus);

        if (data < 0)

                return data;

        ucontrol->value.integer.value[0] = data;

        return 0;

}

static int snd_cs8427_qsubcode_info(struct snd_kcontrol *kcontrol,

                                    struct snd_ctl_elem_info *uinfo)

{

        uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;

        uinfo->count = 10;

        return 0;

}

static int snd_cs8427_qsubcode_get(struct snd_kcontrol *kcontrol,

                                   struct snd_ctl_elem_value *ucontrol)

{

        struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);

        unsigned char reg = CS8427_REG_QSUBCODE;

        int err;

        snd_i2c_lock(device->bus);

        if ((err = snd_i2c_sendbytes(device, &reg, 1)) != 1) {

                snd_printk(KERN_ERR "unable to send register 0x%x byte "

                           "to CS8427\n", reg);

                snd_i2c_unlock(device->bus);

                return err < 0 ? err : -EIO;

        }

        err = snd_i2c_readbytes(device, ucontrol->value.bytes.data, 10);

        if (err != 10) {

                snd_printk(KERN_ERR "unable to read Q-subcode bytes "

                           "from CS8427\n");

                snd_i2c_unlock(device->bus);

                return err < 0 ? err : -EIO;

        }

        snd_i2c_unlock(device->bus);

        return 0;

}

static int snd_cs8427_spdif_info(struct snd_kcontrol *kcontrol,

                                 struct snd_ctl_elem_info *uinfo)

{

        uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;

        uinfo->count = 1;

        return 0;

}

static int snd_cs8427_spdif_get(struct snd_kcontrol *kcontrol,

                                struct snd_ctl_elem_value *ucontrol)

{

        struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);

        struct cs8427 *chip = device->private_data;

        snd_i2c_lock(device->bus);

        memcpy(ucontrol->value.iec958.status, chip->playback.def_status, 24);

        snd_i2c_unlock(device->bus);

        return 0;

}

static int snd_cs8427_spdif_put(struct snd_kcontrol *kcontrol,

                                struct snd_ctl_elem_value *ucontrol)

{

        struct snd_i2c_device *device = snd_kcontrol_chip(kcontrol);

        struct cs8427 *chip = device->private_data;

        unsigned char *status = kcontrol->private_value ?

                chip->playback.pcm_status : chip->playback.def_status;

        struct snd_pcm_runtime *runtime = chip->playback.substream ?

                chip->playback.substream->runtime : NULL;

        int err, change;

        snd_i2c_lock(device->bus);

        change = memcmp(ucontrol->value.iec958.status, status, 24) != 0;

        memcpy(status, ucontrol->value.iec958.status, 24);

        if (change && (kcontrol->private_value ?

                       runtime != NULL : runtime == NULL)) {

                err = snd_cs8427_send_corudata(device, 0, status, 24);

                if (err < 0)

                        change = err;

        }

        snd_i2c_unlock(device->bus);

        return change;

}

static int snd_cs8427_spdif_mask_info(struct snd_kcontrol *kcontrol,

                                      struct snd_ctl_elem_info *uinfo)

{

        uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;

        uinfo->count = 1;

        return 0;

}

static int snd_cs8427_spdif_mask_get(struct snd_kcontrol *kcontrol,

                                      struct snd_ctl_elem_value *ucontrol)

{

        memset(ucontrol->value.iec958.status, 0xff, 24);

        return 0;

}

static struct snd_kcontrol_new snd_cs8427_iec958_controls[] = {

{

        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,

        .info =         snd_cs8427_in_status_info,

        .name =         "IEC958 CS8427 Input Status",

        .access =       (SNDRV_CTL_ELEM_ACCESS_READ |

                         SNDRV_CTL_ELEM_ACCESS_VOLATILE),

        .get =          snd_cs8427_in_status_get,

        .private_value = 15,

},

{

        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,

        .info =         snd_cs8427_in_status_info,

        .name =         "IEC958 CS8427 Error Status",

        .access =       (SNDRV_CTL_ELEM_ACCESS_READ |

                         SNDRV_CTL_ELEM_ACCESS_VOLATILE),

        .get =          snd_cs8427_in_status_get,

        .private_value = 16,

},

{

        .access =       SNDRV_CTL_ELEM_ACCESS_READ,

        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,

        .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),

        .info =         snd_cs8427_spdif_mask_info,

        .get =          snd_cs8427_spdif_mask_get,

},

{

        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,

        .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),

        .info =         snd_cs8427_spdif_info,

        .get =          snd_cs8427_spdif_get,

        .put =          snd_cs8427_spdif_put,

        .private_value = 0

},

{

        .access =       (SNDRV_CTL_ELEM_ACCESS_READWRITE |

                         SNDRV_CTL_ELEM_ACCESS_INACTIVE),

        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,

        .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),

        .info =         snd_cs8427_spdif_info,

        .get =          snd_cs8427_spdif_get,

        .put =          snd_cs8427_spdif_put,

        .private_value = 1

},

{

        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,

        .info =         snd_cs8427_qsubcode_info,

        .name =         "IEC958 Q-subcode Capture Default",

        .access =       (SNDRV_CTL_ELEM_ACCESS_READ |

                         SNDRV_CTL_ELEM_ACCESS_VOLATILE),

        .get =          snd_cs8427_qsubcode_get

}};

int snd_cs8427_iec958_build(struct snd_i2c_device *cs8427,

                            struct snd_pcm_substream *play_substream,

                            struct snd_pcm_substream *cap_substream)

{

        struct cs8427 *chip = cs8427->private_data;

        struct snd_kcontrol *kctl;

        unsigned int idx;

        int err;

        snd_assert(play_substream && cap_substream, return -EINVAL);

        for (idx = 0; idx < ARRAY_SIZE(snd_cs8427_iec958_controls); idx++) {

                kctl = snd_ctl_new1(&snd_cs8427_iec958_controls[idx], cs8427);

                if (kctl == NULL)

                        return -ENOMEM;

                kctl->id.device = play_substream->pcm->device;

                kctl->id.subdevice = play_substream->number;

                err = snd_ctl_add(cs8427->bus->card, kctl);

                if (err < 0)

                        return err;

                if (! strcmp(kctl->id.name,

                             SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM)))

                        chip->playback.pcm_ctl = kctl;

        }

        chip->playback.substream = play_substream;

        chip->capture.substream = cap_substream;

        snd_assert(chip->playback.pcm_ctl, return -EIO);

        return 0;

}

EXPORT_SYMBOL(snd_cs8427_iec958_build);

int snd_cs8427_iec958_active(struct snd_i2c_device *cs8427, int active)

{

        struct cs8427 *chip;

        snd_assert(cs8427, return -ENXIO);

        chip = cs8427->private_data;

        if (active)

                memcpy(chip->playback.pcm_status,

                       chip->playback.def_status, 24);

        chip->playback.pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;

        snd_ctl_notify(cs8427->bus->card,

                       SNDRV_CTL_EVENT_MASK_VALUE | SNDRV_CTL_EVENT_MASK_INFO,

                       &chip->playback.pcm_ctl->id);

        return 0;

}

EXPORT_SYMBOL(snd_cs8427_iec958_active);

int snd_cs8427_iec958_pcm(struct snd_i2c_device *cs8427, unsigned int rate)

{

        struct cs8427 *chip;

        char *status;

        int err, reset;

        snd_assert(cs8427, return -ENXIO);

        chip = cs8427->private_data;

        status = chip->playback.pcm_status;

        snd_i2c_lock(cs8427->bus);

        if (status[0] & IEC958_AES0_PROFESSIONAL) {

                status[0] &= ~IEC958_AES0_PRO_FS;

                switch (rate) {

                case 32000: status[0] |= IEC958_AES0_PRO_FS_32000; break;

                case 44100: status[0] |= IEC958_AES0_PRO_FS_44100; break;

                case 48000: status[0] |= IEC958_AES0_PRO_FS_48000; break;

                default: status[0] |= IEC958_AES0_PRO_FS_NOTID; break;

                }

        } else {

                status[3] &= ~IEC958_AES3_CON_FS;

                switch (rate) {

                case 32000: status[3] |= IEC958_AES3_CON_FS_32000; break;

                case 44100: status[3] |= IEC958_AES3_CON_FS_44100; break;

                case 48000: status[3] |= IEC958_AES3_CON_FS_48000; break;

                }

        }

        err = snd_cs8427_send_corudata(cs8427, 0, status, 24);

        if (err > 0)

                snd_ctl_notify(cs8427->bus->card,

                               SNDRV_CTL_EVENT_MASK_VALUE,

                               &chip->playback.pcm_ctl->id);

        reset = chip->rate != rate;

        chip->rate = rate;

        snd_i2c_unlock(cs8427->bus);

        if (reset)

                snd_cs8427_reset(cs8427);

        return err < 0 ? err : 0;

}

EXPORT_SYMBOL(snd_cs8427_iec958_pcm);

static int __init alsa_cs8427_module_init(void)

{

        return 0;

}

static void __exit alsa_cs8427_module_exit(void)

{

}

module_init(alsa_cs8427_module_init)

module_exit(alsa_cs8427_module_exit)